| |
Records |
Links |
|
Author |
L. Labrousse, S. Elvevold, C. Lepvrier, P. Agard |
|
| |
Title |
Structural analysis of high-pressure metamorphic rocks of Svalbard: Reconstructing the early stages of the Caledonian orogeny |
Type |
Journal |
| |
Year |
2008 |
Publication |
Tectonics |
Abbreviated Journal |
|
|
| |
Volume |
27 |
Issue |
5 |
Pages |
|
|
| |
Keywords |
blueschists Caledonian orogeny structural analysis Svalbard |
|
| |
Abstract |
|
|
| |
Programme |
398 |
|
| |
Campaign |
|
|
| |
Address |
|
|
| |
Corporate Author |
|
Thesis |
|
|
| |
Publisher |
|
Place of Publication |
|
Editor |
|
|
| |
Language |
|
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN  |
1944-9194 |
ISBN |
|
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
yes |
|
| |
Call Number |
|
Serial |
8237 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
Cao A, Romanowicz B, |
|
| |
Title |
Constraints on shear wave attenuation in the Earth's inner core from an observation of PKJKP
|
Type |
Journal Article |
| |
Year |
2009 |
Publication |
Geophysical Research Letters |
Abbreviated Journal |
|
|
| |
Volume |
36 |
Issue |
9 |
Pages |
L09301- |
|
| |
Keywords |
inner core, shear wave, quality factor, 3909 Elasticity and anelasticity, 5144 Wave attenuation, 7207 Core, 7203 Body waves, 8115 Core processes, |
|
| |
Abstract |
|
|
| |
Programme |
133 |
|
| |
Campaign |
|
|
| |
Address |
|
|
| |
Corporate Author |
|
Thesis |
|
|
| |
Publisher |
|
Place of Publication |
|
Editor |
|
|
| |
Language |
|
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
1944-8007 |
ISBN |
|
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
yes |
|
| |
Call Number |
|
Serial |
99 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
Zhang Yang, Ritsema Jeroen, Thorne Michael S, |
|
| |
Title |
Modeling the ratios of SKKS and SKS amplitudes with ultra-low velocity zones at the core-mantle boundary
|
Type |
Journal Article |
| |
Year |
2009 |
Publication |
Geophysical Research Letters |
Abbreviated Journal |
|
|
| |
Volume |
36 |
Issue |
19 |
Pages |
L19303- |
|
| |
Keywords |
core-mantle boundary, SKS waves, amplitudes, 0545 Modeling, 7203 Body waves, 7208 Mantle, |
|
| |
Abstract |
|
|
| |
Programme |
133 |
|
| |
Campaign |
|
|
| |
Address |
|
|
| |
Corporate Author |
|
Thesis |
|
|
| |
Publisher |
|
Place of Publication |
|
Editor |
|
|
| |
Language |
|
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
1944-8007 |
ISBN |
|
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
yes |
|
| |
Call Number |
|
Serial |
108 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
Reymond D, Crusem R, Barriot J P, |
|
| |
Title |
Empirical approaches for fast robust inversion of seismic moment tensor from surface waves
|
Type |
Journal Article |
| |
Year |
2010 |
Publication |
Geophysical Research Letters |
Abbreviated Journal |
|
|
| |
Volume |
37 |
Issue |
7 |
Pages |
L07307- |
|
| |
Keywords |
moment tensor, robust inversion, IRLS, 3260 Inverse theory, 7255 Surface waves and free oscillations, 7215 Earthquake source observations, |
|
| |
Abstract |
We present a method of robust inversion (also called IRLS: Iterative Reweighted Least Squares) which is surprisingly insensitive to outlier data points, as it discards automatically the aberrant points, without the necessity for careful human inspection and control of data quality. Different criteria based on residuals and signal-to-noise ratio are injected into the covariance matrix (acting like a weighting function), to perform the robust inversion using the iterative generalized discrete inverse method of Tarantola-Valette. From a practical point of view, this algorithm is used as the Preliminary Determination of Focal Mechanism (PDFM) method, which is a project for rapid estimation of source parameters of strong earthquakes in the context of tsunami warning. The input data to be inverted are spectra of long period surface waves, and as an output, the computed result is the seismic moment tensor, from which focal geometry of an earthquake, and principal stress axes are obtained. This method can be applied to any other method of non-linear (iterative) inversions confronted to the problem of outlier points polluting the data sets.
|
|
| |
Programme |
133 |
|
| |
Campaign |
|
|
| |
Address |
|
|
| |
Corporate Author |
|
Thesis |
|
|
| |
Publisher |
|
Place of Publication |
|
Editor |
|
|
| |
Language |
|
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
1944-8007 |
ISBN |
|
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
yes |
|
| |
Call Number |
|
Serial |
403 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
Butler Rhett, Tsuboi Seiji, |
|
| |
Title |
Antipodal seismic observations of temporal and global variation at Earth's inner-outer core boundary
|
Type |
Journal Article |
| |
Year |
2010 |
Publication |
Geophysical Research Letters |
Abbreviated Journal |
|
|
| |
Volume |
37 |
Issue |
11 |
Pages |
L11301- |
|
| |
Keywords |
antipode, Earth, core, 7207 Core, 7203 Body waves, 8115 Core processes, |
|
| |
Abstract |
We have found two pairs of earthquake doublets closely located antipodally on one diametral axis between Tonga-Algeria, and several other events on other axes. These doublets show significant correlation, and exhibit seismic phases traversing the Core that cannot be explained by a standard radial Earth model such as PREM. The antipodal waveform data are highly variable between axes. The observed variability of the waveforms indicates global variations in the structure above and below the Inner-Outer Core boundary region. We have found evidence for a regional low-velocity zone at the base of the Outer Core, corresponding with a decadal temporal variation (0.55 s) in seismic energy traversing the top of the Inner Core. We propose an antipodal seismic array to constrain and to provide further progress for the study of the Inner and Outer Core.
|
|
| |
Programme |
133 |
|
| |
Campaign |
|
|
| |
Address |
|
|
| |
Corporate Author |
|
Thesis |
|
|
| |
Publisher |
|
Place of Publication |
|
Editor |
|
|
| |
Language |
|
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
1944-8007 |
ISBN |
|
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
yes |
|
| |
Call Number |
|
Serial |
448 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
Obrebski M J, Ardhuin F, Stutzmann E, Schimmel M, |
|
| |
Title |
How moderate sea states can generate loud seismic noise in the deep ocean
|
Type |
Journal Article |
| |
Year |
2012 |
Publication |
Geophysical Research Letters |
Abbreviated Journal |
|
|
| |
Volume |
39 |
Issue |
11 |
Pages |
L11601- |
|
| |
Keywords |
microseisms, polarization analysis, wave model, 4215 Climate and interannual variability, 4255 Numerical modeling, 4560 Surface waves and tides, 7220 Oceanic crust, 7255 Surface waves and free oscillations, |
|
| |
Abstract |
The location of oceanic sources of the micrometric ground displacement recorded at land stations in the 0.10.3 Hz frequency band (double frequency microseisms) is still poorly known. Here we use one particularly strong noise event in the Pacific to show that small swells from two distant storms can be a strong deep-water source of seismic noise, dominating temporarily the signals recorded at coastal seismic stations. Our interpretation is based on the analysis of noise polarization recorded all around the source, and the good fit achieved for this event and year-round between observed and modeled seismic data. The model further suggests that this is a typical source of these infrequent loud noise bursts, which supports previous inconclusive evidences of the importance of such sources. This new knowledge based on both modeling and observations will expand today's limits on the use of noise for climate studies and seismic imaging.
|
|
| |
Programme |
133 |
|
| |
Campaign |
|
|
| |
Address |
|
|
| |
Corporate Author |
|
Thesis |
|
|
| |
Publisher |
|
Place of Publication |
|
Editor |
|
|
| |
Language |
|
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
1944-8007 |
ISBN |
|
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
yes |
|
| |
Call Number |
|
Serial |
3831 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
|
|
| |
Title |
The K-derived MLT sector geomagnetic indices
|
Type |
Journal Article |
| |
Year |
2013 |
Publication |
GEOPHYSICAL RESEARCH LETTERS |
Abbreviated Journal |
|
|
| |
Volume |
40 |
Issue |
18 |
Pages |
4808-4812 |
|
| |
Keywords |
1530 Rapid time variations, 1555 Time variations: diurnal to decadal, 2784 Solar wind/magnetosphere interactions, 7954 Magnetic storms, geomagnetic indices, MLT sector (Magnetic Local Time sector), |
|
| |
Abstract |
New sub-auroral K-derived sector indices are proposed. They are based upon the K local geomagnetic activity indices from the planetary am network stations, and their derivation scheme draws directly from that of am indices. Four Magnetic Local Time (MLT) sectors are considered, leading to four different K-derived MLT-sector indices: the aσDawn (03-09 MLT), aσNoon (09-15 MLT), aσDusk (15-21 MLT) and aσMidnight (21-03 MLT) indices. They cover more than 4 solar cycles and, thus, allow robust statistical analysis. Statistical studies of the whole aσ data series and case studies for two geomagnetic storms are presented. These analyses clearly show that the four aσ have specific behaviors, and that it is possible to get insight into both the statistical properties of the physical processes responsible for the observed geomagnetic activity and contribution to the dynamics of a given storm. |
|
| |
Programme |
139 |
|
| |
Campaign |
|
|
| |
Address |
|
|
| |
Corporate Author |
|
Thesis |
Bachelor's thesis |
|
| |
Publisher |
|
Place of Publication |
|
Editor |
|
|
| |
Language |
|
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
1944-8007 |
ISBN |
|
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
yes |
|
| |
Call Number |
|
Serial |
4336 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
|
|
| |
Title |
First investigations of IO, BrO, and NO2 summer atmospheric levels at a coastal East Antarctic site using mode-locked cavity enhanced absorption spectroscopy
|
Type |
Journal Article |
| |
Year |
2013 |
Publication |
Geophysical Research Letters |
Abbreviated Journal |
|
|
| |
Volume |
40 |
Issue |
4 |
Pages |
791-796 |
|
| |
Keywords |
0365 Troposphere: composition and chemistry, Antarctica, Atmospheric oxidants, Radicals, |
|
| |
Abstract |
|
|
| |
Programme |
414 |
|
| |
Campaign |
|
|
| |
Address |
|
|
| |
Corporate Author |
|
Thesis |
Bachelor's thesis |
|
| |
Publisher |
|
Place of Publication |
|
Editor |
|
|
| |
Language |
|
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
1944-8007 |
ISBN |
|
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
yes |
|
| |
Call Number |
|
Serial |
4345 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
|
|
| |
Title |
The K-derived MLT sector geomagnetic indices
|
Type |
Journal Article |
| |
Year |
2013 |
Publication |
GEOPHYSICAL RESEARCH LETTERS |
Abbreviated Journal |
|
|
| |
Volume |
40 |
Issue |
18 |
Pages |
4808-4812 |
|
| |
Keywords |
1530 Rapid time variations, 1555 Time variations: diurnal to decadal, 2784 Solar wind/magnetosphere interactions, 7954 Magnetic storms, geomagnetic indices, MLT sector (Magnetic Local Time sector), |
|
| |
Abstract |
|
|
| |
Programme |
905 |
|
| |
Campaign |
|
|
| |
Address |
|
|
| |
Corporate Author |
|
Thesis |
Bachelor's thesis |
|
| |
Publisher |
|
Place of Publication |
|
Editor |
|
|
| |
Language |
|
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
1944-8007 |
ISBN |
|
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
yes |
|
| |
Call Number |
|
Serial |
4504 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
|
|
| |
Title |
Instrumented elephant seals reveal the seasonality in chlorophyll and light-mixing regime in the iron-fertilized Southern Ocean
|
Type |
Journal Article |
| |
Year |
2013 |
Publication |
Geophysical Research Letters |
Abbreviated Journal |
|
|
| |
Volume |
40 |
Issue |
24 |
Pages |
6368-6372 |
|
| |
Keywords |
Southern Ocean, climatology, chlorophyll, iron fertilization, 4855 Phytoplankton, 4805 Biogeochemical cycles, processes, and modeling, 4894 Instruments, sensors, and techniques, |
|
| |
Abstract |
|
|
| |
Programme |
109 |
|
| |
Campaign |
|
|
| |
Address |
|
|
| |
Corporate Author |
|
Thesis |
|
|
| |
Publisher |
|
Place of Publication |
|
Editor |
|
|
| |
Language |
|
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
1944-8007 |
ISBN |
|
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
yes |
|
| |
Call Number |
|
Serial |
4743 |
|
| Permanent link to this record |
